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| author | Dennis Zhou (Facebook) <dennisszhou@gmail.com> | 2018-09-11 14:41:28 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-09-21 20:29:05 -0600 |
| commit | 07b05bcc3213ac9f8c28c9d835b4bf3d5798cc60 (patch) | |
| tree | efab6cd44e334f64c1a98ae1b57a6894d9130c23 /block/blk-iolatency.c | |
| parent | 49f4c2dc2b5066e9211101c59cc0828e81d41614 (diff) | |
| download | linux-stable-07b05bcc3213ac9f8c28c9d835b4bf3d5798cc60.tar.gz linux-stable-07b05bcc3213ac9f8c28c9d835b4bf3d5798cc60.tar.bz2 linux-stable-07b05bcc3213ac9f8c28c9d835b4bf3d5798cc60.zip | |
blkcg: convert blkg_lookup_create to find closest blkg
There are several scenarios where blkg_lookup_create can fail. Examples
include the blkcg dying, request_queue is dying, or simply being OOM. At
the end of the day, most handle this by simply falling back to the
q->root_blkg and calling it a day.
This patch implements the notion of closest blkg. During
blkg_lookup_create, if it fails to create, return the closest blkg
found or the q->root_blkg. blkg_try_get_closest is introduced and used
during association so a bio is always attached to a blkg.
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-iolatency.c')
0 files changed, 0 insertions, 0 deletions